Silva said Castellano directed authorities to the body in an oil field between Odessa and Midland on Sunday, but detectives still have to confirm the identity of the remains. The victim's family reported her missing on Sept. 25.

Castellano told investigators that he left his son with relatives while he disposed of the body, Silva said.

The suspect told police last week that he was in Odessa with their son and agreed to give a statement. He said he killed Warner after they got into a heated argument at their home in Sharpstown, Silva said.